hf ssb codan on td5 and injector noise

[airmonterosa]

Goodmorning everyone! I have installed a Codan 9360 on my def Td5 and its tuner antenna on the front bumper. Both radio and antenna are connected to the frame mass with generous diameter cables. But electric noise on the radio is so strong that it covers the signals received. I know they should place ferrite toroids on the injector cables near the ECU and the turbo. Does anyone have a cable photo near the ECU? Thanks in advance
mk

[scanfor]

I hate to say it, but the issue my be more serious than a few ferrite beads can fix.
Friends of mine with a Td5 have abandoned their HF because the noise makes it useless, and knowing these guys they will have tried a few things first.

[trout1105]

Maybe if you shut the engine down when you need to use the HF the noise may go away [bigwhistle]

[oka374]

I used to install HF's in all sorts of vehicles and boats and when the TD5's came out after much grief we gave up trying to lower the electrical noise to a usable level when the engine is going, simply put nothing works enough to lower the noise to the stage where the receiver front end isn't "overloaded".
If you wish to use a HF in a TD5 powered vehicle then the engine MUST be turned off.

[Davo]

Apparently that was one reason various militaries didn't use the TD5. You'll need a specialist. There was a crazy story from the VKS-737 newsletter quite a few years ago about a member whose engine, (not a Land Rover), would simply die when he tried to transmit. A specialist managed to fix the problem, but the member didn't know what was done exactly. Certainly it was more than the aforementioned ferrite beads.

[rangieman]

Apparently that was one reason various militaries didn't use the TD5. You'll need a specialist. There was a crazy story from the VKS-737 newsletter quite a few years ago about a member whose engine, (not a Land Rover), would simply die when he tried to transmit. A specialist managed to fix the problem, but the member didn't know what was done exactly. Certainly it was more than the aforementioned ferrite beads.
A friend had a similar issue many moon`s ago with a 27 MHz radio in a V8 stage1 and the fix was to put a earth strap from the bonnet to the body [wink11]

[Davo]

With a points dizzy? Now that's weird.

[JDNSW]

My 2a was a FFR - and it had bonding straps between the bonnet and the firewall, as well as suppressors on the wiper motor. Worth a try. Points ignition, generators, any brush motors, all create RFI.

One of the issues today in many fields is that with most people listening to FM radio rather than AM, and a lot more RFI generating equipment as everything goes digital, society seems to have become much more tolerant of RFI.

John

[Graeme]

A bonnet not properly earthed acts as a radiator for any RF produced below it rather than a ground plane for the antenna.
As well as RF chokes on the power, microphone and tuner control cables right at the set and another at the tuner on its control cable, a suitable band-stop or band-pass filter may be required between the antenna and the set. The antenna may need to be relocated to the rear too.

[trout1105]

Most people only use their HF radios for a daily "Skip" to give their position and to let someone know that they are OK, This is usually done in the evening or just before you set up camp for the night.
Or the HF is only used in an emergency So turning the engine off in these circumstances is No Big deal.
If however you want to use the HF as a general Chat channel whilst driving then the interference from the engine will be problematic and possibly expensive to rectify.
Anyway in most situations it is Far easier to hear the HF radio when the truck is stationary with the engine turned off (especially a diesel engine) as there is no engine, track or wind noise as well as the interference from the engine, It also makes it easier for the person listening to your call understand what you are saying.

[Tins]

Solving HF interference from the TD5 motor (https://www.aulro.com/afvb/communications-car-audio-and-electronics/95110-solving-hf-interference-td5-motor.html)

[chrisl9515]

Radiated emissions 124813 from 2003 Discovery Td5. If its any use to anyone all the spurious appear to be down at the lower end of the HF band as low as 733 KHz, with the primary at 1.5444250MHz at approximately -50 dBm as measured from max hold 360 degrees around the vehicle (note the maximum emissions are from the engine bay on the drivers side.I suspect a good quality high pass filter will sort these HF issue out at least making HF reception possible.

[rover-56]

I had a Codan HF in my D2 TD5 and had that interference. Mostly from the injectors and mostly below 7 MHz.
I made the radio quite useable by placing 3 snap on ferrites on the injector loom as close to the engine as I could get, and a couple more on the power lead near the radio. The Codan is quite good at rejecting non voice interference anyway.
The difference between mine and yours is that I had the antenna on the back door.

I still have the bracket. PM me if interested.
( Edit- sorry just noticed you have a Defender)

Cheers,
Terry